Dynamics of tear fluid components transportation through contact lenses

The interference optical method has been applied to monitor the transportation of Na+ and Cl− in solution through new and used contact lenses. The phenomenon of passive transportation (simple diffusion), induced by differences in osmotic pressure on both sides of the contact lenses has been discussed. Permeability coefficient of contact lenses of different optical power: −2.75 D and −3.75 D has been calculated.